Blower capable of reducing secondary flow

ABSTRACT

A blower capable of reducing secondary flow comprises a frame and a wheel blade part. The wheel blade part is mounted in the frame. The wheel blade part is composed of a hub and a plurality of blades surrounding the hub. The frame is composed of a base and an upper lid plate with a projection part being provided at inner side of the base. The projection part corresponds to the blades on the wheel blade part. A first guide part and a second guide part are provided at an air passage of the base near an opening thereof. The secondary flow produced in the blower can be reduced by way of the projection at the inner side of the base and the first and second guide parts at the air passage of the base near the opening thereof.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is related to a blower capable of reducing secondary flow and particularly to a frame device used in a blower.

2. Brief Description of the Related Art

Referring to FIGS. 1 and 2, the conventional blower 1 includes a frame 11 and a wheel blade part 12 disposed in the frame 11. The frame 11 is composed of a base 111 and an upper lid plate 112. The wheel blade part 12 is composed of a hub 121 and a plurality of blades 122 surrounding the hub 121.

Referring to FIG. 3, a distance results between the lower edges 122 a of the blade 122 and the inner side 111 a of the base 111 to produce a secondary flow at a space formed by the distance. The secondary flow can result in loud noise and block the airflow so as to reduce the overall air pressure and amount of the airflow.

Although the base 111 of the conventional blower 1 can be lifted the inner side 111 a thereof to decrease the distance to the lower edges 122 a of the blades 122 in order to reduce occurring the secondary flow, the inner space of the base 111 becomes smaller too to lead reduction of the overall air pressure and the amount of airflow.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a blower capable of reducing secondary flow.

BRIEF DESCRIPTION OF THE DRAWINGS

The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which:

FIG. 1 is an exploded perspective view of a conventional blower;

FIG. 2 is an assembled perspective view of the conventional blower;

FIG. 3 is a sectional view along line 3-3 shown in FIG. 2;

FIG. 4 is an exploded perspective view of the blower according to the present invention;

FIG. 5 is an assembled perspective view of the blower according to the present invention; and

FIG. 6 is a sectional view along line 6-6 according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 4 and 5, a blower 2 according to the present invention comprises a frame 21 and a wheel blade part 22. The wheel blade part 22 is composed of a hub 221 and a plurality of blades 222 surrounded the hub 221. The frame 21 is composed of a base 211 and an lid plate 212 and base 211 at the inner side 211 a thereof is provided with a projection part 211 b corresponding to the lower edges 222 a of the blades 222 on the wheel blade part 22.

Referring to FIG. 6, the projection part 211 b reduces the distance between the lower edges 222 a and the inner side 211 a to the least extent and partitions the distance. When the wheel blade part 22 rotates, the airflow introduced by the blades 222 can be restricted by the projecting part 211 b to allow the airflow being not easy to constitute secondary flow between the lower edges 222 a of the blades 222 and the inner side 211 a of the base 211.

Referring to FIGS. 3 to 6, the projection part 211 b at the inner side of the base 211 can overcome the deficiency of excessive large distance between the lower edges 122 a of the blades 122 producing the secondary flow. In addition, the air pressure and airflow are increased at the opening 211 d provided at the base 211.

Besides, a first guide part 211 e and a second guide part 211 f can be provided at air passage 211 c of the base 211 near the opening 211 d to reduce noise created by the wheel blade part 22 of the blower 2 during running.

While the invention has been described with referencing to the preferred embodiment thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims. 

1. A blower capable of reducing secondary flow, comprising: a frame, being composed of a base and an upper lid plate and a projection part being provided at inner side of base; and a wheel blade part, being composed of a hub and a plurality of blades surrounding the hub and being mounted in the frame. a frame, being composed of a base and an upper lid plate and a projection part being provided at inner side of base.
 2. The blower capable of reducing secondary flow as defined in claim 1, wherein a first guide part and a second guide part is provided at an air passage of the base near an opening thereof. 